Welcome to the Digital Library for Physics and Astronomy

The SAO/NASA Astrophysics Data System (ADS) is a Digital
Library portal for researchers in Astronomy and Physics, operated
by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant.
The ADS maintains three bibliographic databases containing more than
14.0 million records covering publications in
Astronomy and Astrophysics, Physics, and the
arXiv e-prints.
Abstracts and full-text of major astronomy and physics
publications are indexed and searchable through the new
ADS interface
as well as the traditional
"Classic" search forms.
A set of browsable legacy interfaces
are also available.

In addition to maintaining its bibliographic corpus,
the ADS tracks citations and usage of its records to provide
advanced discovery and evaluation capabilities.
Integrated in its databases, the ADS provides
access and pointers to a wealth of external resources, including
electronic articles available from publisher's websites,
astronomical object information, data catalogs and data sets
hosted by external archives. We currently have links to
over 13.7 million records maintained by our
collaborators.

Please note that all abstracts and articles in the ADS are copyrighted by the publisher, and their use is free for personal use only.
For more information, please read our page detailing the
Terms and Conditions
regulating the use of our resources.

The ADS provides the
myADS Update Service,
a free custom
notification service promoting current awareness of the recent
technical literature in astronomy and physics based on each individual
subscriber's queries. Every week
the myADS Update Service will scan the literature added to the ADS since the
last update, and will create custom lists of recent papers for each
subscriber, formatted to allow quick reading and access. Subscribers
are notified by e-mail in html format.
As an option, users can elect to receive
updates on preprints published on the arXiv
e-print archive via daily emails or by subscribing to a custom RSS feed.

In 2016 the
ADS Users Group (ADSUG)
was established to advise the project
and to recommend changes and improvements to both its services
and procedures in order to maximize the scientific productivity of the
community it serves. The ADSUG will advocate for the user community
and provide suggestions regarding content curation, technical
infrastructure, management, and priority setting.